No back steering for an outboard motor

ABSTRACT

Disclosed herein is an outboard motor having releasable means in the form of a wrap spring engaged between a king pin and a swivel bracket for preventing relative pivotal movement between the king pin and the swivel bracket. Also disclosed herein are means for releasing the wrap spring including a shaft which is pivotally carried by the king pin co-axially therewith and has means for disengaging locking engagement of the wrap spring between the king pin and the swivel bracket. Also disclosed herein are means connecting and releasing means to the king pin to effect steering movement of the outboard motor after release of the releasable means in response to the application of a steering force to said releasing means.

[451 June 13, 1972 United States y Patent Shimanckas [54] NO BACKSTEERING FOR AN OUTBOARD MOTOR [72] Inventor: William J. Shimanckas,Waukegan, Ill.

Outboard Marine Corporation, kegan,lll.

[57] ABSTRACT Disclosed herein is an outboard motor having releasableWau- [ 73] Assignee:

[22] Filed: July'l7, 1970 l means in the form of a wrap spring engagedbetween a king [2 l] Appl' No" 55780 pin and a swivel bracket forpreventing relative pivotal movementbetween the king pin and the swivelbracket. Also disclosed herein are means for releasing the wrap springincluding a shaft which is pivotally carried by the king pin co-axiailytherewith and has means for disengaging locking engagement of the wrapspring between the king pin and the swivel R6C SHS 11N. l 529 lhl 13. 68Bl n/ l [56] References cned bracket. `Also disclosed herein are meansconnecting and UNITED STATES PATENTS 3/1960 Bevis et releasing means ltothe king pin to effect steering movement of the outboard motor afterrelease of the releasable means in l'15/ 18 response to the applicationof a steering force to said releasing 115/18 means.

2,927,551 2,947,278 8/1960 Magilletal..............................

3 Claims, 4 Drawing Figures Primary Examiner-Andrew H. FarrellPATENTEDJUH 1 s ma ahiulw JM y .i/z.

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NO BACK STEERING FOR AN OUTBOARD MOTOR RELATED APPLICATIONS BACKGROUNDOF THE INVENTION Marine propulsion devices of the type contemplatedherein, such as outboard motors and stern drive units, include apropulsion unit supported by a king pin for `pivotal steering movementon a swivel bracket supported on the transom of a boat by a stern orclamp bracket. Steering movements are generally imparted to thepropulsion unit through a remote steering arrangement which can includea push-pull cable or a steering rope. Such propulsion units are alsosubject to steering movements or backlash in response to forcesoriginating in the propulsion unit.

My earlier U.S. Pat. No. 3,310,021 discloses one arrangementfor lockinga propulsion unit against unwanted steering movements. My earlierabove-identified applications Ser. Nos. 825,716 and 825,834 alsodisclose arrangements for preventing unwanted steering movements causedby forces originating with the steerable propulsion unit. Anotherarrangement for preventing unwanted steering movements by forcesoriginating in the propulsion unit is disclosed in the Irgens et al.application Ser. No. 805,049 filed Mar. 6, 1969 and entitled SteeringMechanism for a Marine Propulsion Unit.

SUMMARY OF THE INVENTION The invention provides an arrangement includingreleasable means engaged between the king pin and the swivel bracket ofa marine propulsion device for preventing relative pivotal movementbetween the king `pin and the swivel bracket, together with means forreleasing the releasable means, and means connecting the releasing meansto the king pin to eect propulsion unit steering movement after releaseof the releasable means in response to the application of a steeringforce to the releasing means.

l In accordance with the invention', the releasable means comprises awrap spring which is normally clampingly engaged against an innersegmented cylindrical surface formed integrally with,or on parts xedlyattached to, the king pin and the swivel bracket.

Also in accordance with the invention, the means for releasing thereleasable means includes the provision of a shaft located in a bore inthe king pin for co-axial pivotal movement relative to the king pin andincluding means extending through openings in the king pin to engage theends of the wrap spring to retract the wrap spring from clampingengagement with the swivel bracket in response to pivotal movement ofthe shaft contained in the bore of the king pin.

Pivotal movement of the shaft is afforded in response to pivotalmovement of a releasing bracket pivotally mounted co-axially with theking pin axis and extending into overlying relation to a steering armextending from the king pin.

Also in accordance with the invention, the means for effectingpropulsion unit steering movement after release of the releasable meansin response to the application of a steering force to the releasingmeans includes a pair of spaced ears or tabs on one of the steering armand the releasing bracket and a projection extending from the other ofthe steering arm and the releasing bracket and into the space betweenthe tabs in the path of pivotal movement of the ears, whereby there isafforded an initial range of lost relative angular movement between thesteering arm and the releasing bracket, followed byinterferinglengagement of the projection with one of the ears to provide commonpivotal movement of the steering arm with the releasing bracket.

One of the principal objects of the invention is the provision of a newand improved arrangement for preventing steering movements of a marinepropulsion unit in response to forces originating in the marinepropulsion unit.

Another of the principal objects of the invention is the provision of aneconomical and compact arrangement for releasably locking a propulsionunit against steering movement while, at the same time, affordingrelease of said lock upon the application of a steering force by theoperator.

Still another principal object of the invention is the provision of awrap spring arrangement which is releasably engageable between a kingpin and a swivel bracket to releasably prevent pivotal movementtherebetween.

Still another object of the invention is the provision of a steeringarrangement which prevents self-induced propulsion unit steeringmovement, and which is economical to manufacture, and which will providereliable service over a long and useful life.

Other objects and advantages of the invention will become known byreference to the following description and accompanying drawings.

DRAWINGS FIG. l is a perspective view-of an outboard motor embodyingvarious of the features of the invention.

FIG. 2 is a partially schematic perspective view, partially broken awayand in section, of a portion of the outboard motor shown in FIG. 1. v

FIG.A3 is a sectional view of a part of the portion shown in FIG. 2. l

FIG. 4 is an enlarged fragmentary sectional view taken along line 4-4 ofFIG. 3.

DETAILED DESCRIPTION Shown in the drawings is an outboard motor 1lwhich, in accordance with the invention, includes an arrangement forpreventing steering action induced by the propulsion unit whilepermitting steering action in response to the operation of a user, andby a remote steering apparatus, and which is otherwise of conventionalconstruction.

More specifically, the outboard motor 11 shown in FIG. 1 conventionallyincludes a transom clamp or-bracket 13 which is adapted to be connectedto the transom of a boat. Connected to the transom bracket 13 about ahorizontal axis is a swivel bracket 17 which is accordingly verticallypivotable. The swivel bracket 17 includes a bore 19 which extendsperpendicularly to the horizontal axis and supports a pair of spacedbearings 21 and 23 which receive a king pin 27 conventionally connected,adjacent its upper and lower ends by suitable upper and lower brackets29 and 3l to a propulsion unit 33 (See FIG. 1) carrying a power head 37and a lower unit 39. The power head 37 includes an engine (not shown)and associated components and the lower unit 39 includes a drive shafthousing 41 which supports the power head 37 and has, at the lower endthereof, a gear box 43 carrying a reversing transmission (not shown) anda propeller 47. Vibration isolating mounts (not shown) can beconventionally interposed between the king pin 27 and the propulsionunit 33. At its upper end, the king pin 27 includes a more or lessconventional steering arm 49 which, when pivotally moved to port orstarboard, causes pivotal movement of the king pin 27 and connectedpropulsion unit 33 relative to the swivel bracket 17. As thus fardescribed, the construction is entirely conventional.

In accordance with the invention, there is provided releasable meansengaged between the king pin 27 and the swivel bracket 17 for preventingrelative pivotal movement between the king pin 27 and the swivel bracket17 and, thus preventing self-induced steering operation by thepropulsion unit 33. Also in accordance with the invention, there isprovided means for releasing the releasable means, thereby to affordsteering action by a remote steering arrangement (not shown), togetherwith means connecting the release means tothe king pin 27 to effectpropulsion unit steering movement after release of the releasable meansin response to the application of a steering force initiated by the userto the release means.

More particularly in accordance with the invention, the means forpreventing relative pivotal movement between the king pin 27 and theswivel bracket 17, comprises formation of the king pin 27 and swivelbracket 17 to provide a segmented, continuous cylindrical surface means,together with a wrap spring 57 which is formed and assembled relative tothe cylindrical surface means so as to be normally biased intoengagement with the segments of the cylindrical surface means, therebylocking the swivel bracket 17 and king pin 27 against relative pivotalmovement.

While various other constructions could be employed, in the disclosedconstruction, the cylindrical surface means includes a centrally locatessleeve 59 which is suitably fixed, as by a set screw 61 or otherwise,within the bore 19 of the swivel bracket 17. The sleeve 59 has an innercylindrical surface 63 forming one segment of the cylindrical surfacemeans.

Located above and below the sleeve 59 are respective upper and lowercup-shaped cylindrical members 67 and 69 which are respectively open atthe ends adjacent to the sleeve 59, which have respective innercylindrical surfaces 71 and 73 extending continuously from the sleeveinner surface 63, and constituting segments of the cylindrical surfacemeans, and which have, respective, centrally apertured ends or webs 77and 79 receiving the main part of the king pin 27. The cupshapedcylindrical members 67 and 69 are suitably rigidly connected to the kingpin 27 as by respective set screws 81 and 83 or other suitable means.

ln order to permit radially inward movement of the wrap spring 57 awayfrom engagement with the cylindrical surfaces 63, 71 and 73, the radialdistance between the cylindrical surface means and the outer surface 87(See FIG 3) of the king pin 27 is in excess of the radial depth of thecoils of the wrap spring 57.

The wrap spring 57 is located between the outer surface 87 of the kingpin 27 and the cylindrical wall means and is biased so that the coilsthereof are normally in gripping engagement with each of the cylindricalsurfaces 63, 7l and 73. At its ends, the wrap spring 57 includesoppositely bent, respective upper and lower hook portions 89 and 91which constitute part of the means for releasing the wrap spring 57 fromengagement with the swivel bracket sleeve 59 and the king pin cupmembers 67 and 69 so as to afford pivotal movement of the king pin 27and accompanying propulsion unit 33 relative to the swivel bracket 17.

Various means can be employed for releasing the releasable means topermit pivotal movement between the swivel bracket 17 and the king pin27. In the disclosed construction, such means includes formation of theking pin 27 with a central bore 97 co-axial with the pivotal axis of theking pin 27 and with upper and lower radial openings 99 and 101 whichare located in the wall of the king pin 27, which communicate with thebore 97, and which are spaced axially at a distance corresponding to theaxial spacing between the hooked end portions 89 and 91 ofthe wrapspring 57.

The release means also includes a releasing shaft 111 which is pivotablein the bore 97 of the king pin 27 and which includes respective upperand lower axially spaced release pins 113 and 115 extending respectivelythrough the openings 99 and 101 into the respective bites of the hookedend portions 89 and 91 of the wrap spring 57. Thus, when the releaseshaft 111 is pivoted in the clockwise direction as shown in FIG. 2, theupper pin 113 serves to angularly displace the upper end of the wrapspring 57 in the clockwise direction so as to tighten the coils, andrelease engagement of the wrap spring coils with the upper king pin cupmember 67 and with the swivel bracket sleeve 59, thereby permittingrelative movement of the king pin 27 and propulsion unit 33 relative tothe swivel bracket 17.

When the releasing shaft 111 is pivoted in the other rotative direction,i.e., in the counterclockwise direction as shown in FIG. 2, the lowerpin 115 displaces the lower hooked end portion 91 of the wrap spring 57to provide a similar action relieving the grip of the wrap spring 57 onthe swivel bracket sleeve 59 and on the lower king pin cup member 69.

Upon release of the force which pivoted the releasing shaft 111, thewrap spring 57 will promptly expand to again lock the king pin 27 to theswivel bracket 17 and to pivot the releasing shaft 111 back to a normalposition accompanying normal grip of the wrap spring 57 with the swivelbracket sleeve 59 and with the king pin cup members 67 and 69,

The releasing shaft 111 extends outwardly at the upper ends of the kingpin 27 and is pivotable to release the wrap spring 57 by a releasingbracket or arm 121 which is mounted for free pivotal movement on areduced diameter end portion 123 of the releasing shaft 111 and aboutthe king pin axis. Pivotal movement of the releasing bracket 121 topivot the releasing shaft 111 is afforded by means which can takevarious forms and, in the disclosed construction, comprises a rearwardlyextending lever 125 which extends from the projecting upper end of thereleasing shaft 111 and which is connected to the rearwardly extendingend 127 of the release bracket 121 by a pin 129 located at a radialdistance rearwardly of the king pin axis. At its forward end 131, therelease bracket includes means including one or more apertures 133adapted for connection to a remote steering arrangement which caninclude such components as a push-pull cable or a steering rope. Ofcourse, the releasing bracket 121 can also be adapted for manualoperation.

Upon the application of a steering force to the releasing bracket 121,the releasing bracket 121 will pivot about the king pin axis and, in sodoing, will angularly displace the lever 125 to move the releasing shaft111 and the pins 113 and 115 to effect release of the grip of the wrapspring 57 with the swivel bracket sleeve 59.

Also in accordance with the invention, means are provided for connectingthe release means to the king pin 27 to effect propulsion unit steeringmovement after release of the releasable means in response to theapplication of a steering force to the release means. While variousconstructions can be employed, in the disclosed construction, thereleasing bracket 121 overlies the steering arm 49 and cooperating meansare provided on the releasing bracket 121 and on the steering arm 49 toafford a range of limited lost pivotal movement therebetween prior toeffecting common pivotal movement. Thus, in the disclosed construction,the steering arm 49 includes a raised projection 141 in the path ofpivotal movement and between a pair of spaced ears or tabs 143 whichdepend from the releasing bracket 121. Thus, in response to theapplication of an initial steering force, the releasing bracket 121 willinitially pivotally move relative to the steering arm 49 and willthereby effect relative pivotal movement of the releasing' shaft 111relative to the king pin 27, whereby to release the wrap spring 57 fromthe swivel bracket sleeve 59. The continued application of asteeringforce to the releasing bracket 121, and the accompanying pivotalmovement of the releasing bracket 121, will effect engagement betweenthe projection 141 on the steering arm 49 and one of the ears or tabs143, whereby, thereafter, common pivotal movement of the steering arm 49with the releasing bracket 121 will occur (the wrap spring 57 beingdisengaged) to effect pivotal movement of the king pin 27 and connectedpropulsion unit 33 relative to the swivel bracket 17.

When the steering force applied to the releasing bracket 121 isdiscontinued, the wrap spring 57 will expand, thereby again locking theking pin 27 to the swivel bracket 17, and will tend to pivot thereleasing shaft 111 into a position locating the releasing bracket 121in centered position above the steering arm 49, so as to aord, inresponse to the application of a steering force to the releasing bracket121, an initial amount of lost angular movement therebetween duringwhich the wrap spring 57 is disengaged prior to propulsion unit turningmovement.

Various of the features of the invention are set forth in the followingclaims.

What is claimed is:

1. An outboard motor comprising a swivel bracket having a bore therein,a propulsion unit, a king pin connected to said propulsion unit, andbeing pivotally received in said bore, and

including a steering arm adapted to be pivoted by an applied force toeffect common pivoting of said king pin and said propulsion unitrelative to said swivel bracket, releasable means for preventingrelative pivotal movement between said king pin and said swivel bracketand including an inner cylindrical surface on said swivel bracket andopposed cup members on said king pin having inner cylindrical surfacesextending continuously from said inner surface of said swivel bracket,and a wrap spring biased 'into engagement with each of said innercylindrical surfaces on said cup members and on said swivel bracket andincluding, at the ends thereof, reversely bent hook portions eachdefining a bite, means for releasing said releasable means including anaxial bore in said king pin and a pair of radial openings extendingthrough said king pin and communicating with said bore, a shaftpivotally received in said bore and including an upper end extendingbeyond said king pin and also including axially spaced pins extendingfrom said shaft and through said openings into engagement with saidbites at the ends of said wrap spring for releasing the engagement ofsaid spring with at least one of said swivel bracket and said king pinin response to pivoting of said shaft, a releasing bracket mounted forpivotal movement about said upper end of saidshaft and about the pivotaxis of said king pin and including means connected betweenA saidreleasing bracket and said shaft for pivoting said `shaft in response topivoting of said releasing bracket and means adapted for receiving asteering forceapplied to pivot said releasing bracket, andmeans'including a pair of spacedy tabs on one of said steering arm andsaid releasing bracket and a projection extending between said tabs andin the path of movement of said tabs on the other of said steering armand releasing bracket for providing a range of limited lost pivotalmovement therebetween prior to effecting common pivotal movement,whereby initial pivotal movement of said bracket relative to saidsteering arm in response to the application of a steering force effectsrelative pivotal movement between said bracket and said steering arm andrelative pivotal movement of said shaft relative to said king pin toeffect release of the engagement of said wrap spring with at least oneof said king pin and said swivel bracket, and whereby continued pivotalmovement of said bracket effects common pivotal movement of saidsteering arm with said bracket to effect pivotal movement of saidpropulsion unit relative to said swivel bracket.

, 2. An outboard motor comprising a swivel bracket having a boretherein,a propulsion unit, a king pin pivotally received in said bore andconnected at its upper and lower ends to said propulsion unit for commonswinging movement of said propulsion unit and king pin relative to saidswivel bracket, a steering arm connected to said king pin and adapted tobe pivoted by an applied forece to eect common pivoting of said king pinand said propulsion unit relative to said swivel bracket, an innercylindrical surface on said swivel bracket, opposed cup members on saidking pin having inner cylindrical surfaces extending continuously fromsaid inner surface of said swivel bracket, a single wrap spring biasedinto engagement with each of said inner cylindrical surfaces on said cupmembers and on said swivel bracket and including, at the ends thereof,reversely bent hook portions each defining a bite, an axial bore in saidking pin, a pair of radial openings extending through said king pin andcommunicating with said bore, a shaft pivotally received in said boreand including axially spaced pins extending from said shaft and throughsaid openings into engagement with said bites .at the ends of said wrapspring for releasing the engagement `of said spring with at least one ofsaid swivel bracket and said king pin in response to pivoting of saidshaft.

3. An outboard motor comprising a swivel bracket having a bore therein,a propulsion unit, a king pin pivotally received in said bore andconnected at its upper and lower ends to said propulsion unit for commonswinging movement of said propulsion unit and king pin relative to saidswivel bracket, a steering arm connected to said king pin and adapted tobe Eivoted by an applied force to effect common pivoting of said lng pmand said propulsionv unit relative to sat swivel bracket, releasablemeans for preventing relative pivotal movement between said king pin andsaid swivel bracket and including a wrap spring biased into engagementwith surfaces on each of said swivel bracket and said king pin, meansfor releasing said releasable means including an axial bore in said kingpin, an opening extending through said king pin and communicating withsaid bore, a shaft pivotally received in said bore and including anupper end extending beyond said king pin and also including a pinextending from said shaft and through said opening into engagement withsaid wrap spring for releasing the engagement of said spring with atleast one of said swivel bracket and said king pin in response topivoting of said shaft, a releasing bracket mounted for pivotal movementabout said upper end of said shaft and about the pivot axis of said kingpin and including means connected between said releasing bracket andsaid shaft for pivoting said shaft in response to pivoting of saidreleasing bracket and means adapted for receiving a steering forceapplied to pivot said releasing bracket, a pair of spaced tabs on one ofsaid steering arm and said releasing bracket and a projection extendingbetween said tabs and in the path of movement of said tabs on the otherof said steering arm and releasing bracket for providing a range oflimited lost pivotal movement therebetween prior to effecting commonpivotal movement, whereby initial pivotal movement of said bracketrelative to said steering arm in response to the application of asteering force effects relative pivotal movement between said bracketand said steering arm and relative pivotal movement of said shaftrelative to said king pin to effect release of the engagement of saidwrap spring with at least one of said king pin and said swivel bracket,and whereby continued pivotal movement of said bracket effects commonpivotal movement of said steering arm with said bracket to effectpivotal movement of said propulsion unit relative to said swivelbracket.

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1. An outboard motor comprising a swivel bracket having a bore therein,a propulsion unit, a king pin connected to said propulsion unit, andbeing pivotally received in said bore, and including a steering armadapted to be pivoted by an applied force to effect common pivoting ofsaid king pin and said propulsion unit relative to said swivel bracket,releasable means for preventing relative pivotal movement between saidking pin and said swivel bracket and including an inner cylindricalsurface on said swivel bracket and opposed cup members on said king pinhaving inner cylindrical surfaces extending continuously from said innersurface of said swivel bracket, and a wrap spring biased into engagementwith each of said inner cylindrical surfaces on said cup members and onsaid swivel bracket and including, at the ends thereof, reversely benthook portions each defining a bite, means for releasing said releasablemeans including an axial bore in said king pin and a pair of radialopenings extending through said king pin and communicating with saidbore, a shaft pivotally received in said bore and including an upper endextending beyond said king pin and also including axially spaced pinsextending from said shaft and through said openings into engagement withsaid bites at the ends of said wrap spring for releasing the engagementof said spring with at least one of said swivel bracket and said kingpin in response to pivoting of said shaft, a releasing bracket mountedfor pivotal movement about said upper end of said shaft and about thepivot axis of said king pin and including means connected between saidreleasing bracket and said shaft for pivoting said shaft in response topivoting of said releasing bracket and means adapted for receiving asteering force applied to pivot said releasing bracket, and meansincluding a pair of spaced tabs on one of said steering arm and saidreleasing bracket and a projection extending between said tabs and inthe path of movement of said tabs on the other of said steering arm andreleasing bracket for providing a range of limited lost pivotal movementtherebetween prior to effecting common pivotal movement, whereby initialpivotal movement of said bracket relative to said steering arm inresponse to the application of a steering force effects relative pivotalmovement between said bracket and said steering arm and relative pivotalmovement of said shaft relative to said king pin to effect release ofthe engagement of said wrap spring with at least one of said king pinaNd said swivel bracket, and whereby continued pivotal movement of saidbracket effects common pivotal movement of said steering arm with saidbracket to effect pivotal movement of said propulsion unit relative tosaid swivel bracket.
 2. An outboard motor comprising a swivel brackethaving a bore therein, a propulsion unit, a king pin pivotally receivedin said bore and connected at its upper and lower ends to saidpropulsion unit for common swinging movement of said propulsion unit andking pin relative to said swivel bracket, a steering arm connected tosaid king pin and adapted to be pivoted by an applied forece to effectcommon pivoting of said king pin and said propulsion unit relative tosaid swivel bracket, an inner cylindrical surface on said swivelbracket, opposed cup members on said king pin having inner cylindricalsurfaces extending continuously from said inner surface of said swivelbracket, a single wrap spring biased into engagement with each of saidinner cylindrical surfaces on said cup members and on said swivelbracket and including, at the ends thereof, reversely bent hook portionseach defining a bite, an axial bore in said king pin, a pair of radialopenings extending through said king pin and communicating with saidbore, a shaft pivotally received in said bore and including axiallyspaced pins extending from said shaft and through said openings intoengagement with said bites at the ends of said wrap spring for releasingthe engagement of said spring with at least one of said swivel bracketand said king pin in response to pivoting of said shaft.
 3. An outboardmotor comprising a swivel bracket having a bore therein, a propulsionunit, a king pin pivotally received in said bore and connected at itsupper and lower ends to said propulsion unit for common swingingmovement of said propulsion unit and king pin relative to said swivelbracket, a steering arm connected to said king pin and adapted to bepivoted by an applied force to effect common pivoting of said king pinand said propulsion unit relative to said swivel bracket, releasablemeans for preventing relative pivotal movement between said king pin andsaid swivel bracket and including a wrap spring biased into engagementwith surfaces on each of said swivel bracket and said king pin, meansfor releasing said releasable means including an axial bore in said kingpin, an opening extending through said king pin and communicating withsaid bore, a shaft pivotally received in said bore and including anupper end extending beyond said king pin and also including a pinextending from said shaft and through said opening into engagement withsaid wrap spring for releasing the engagement of said spring with atleast one of said swivel bracket and said king pin in response topivoting of said shaft, a releasing bracket mounted for pivotal movementabout said upper end of said shaft and about the pivot axis of said kingpin and including means connected between said releasing bracket andsaid shaft for pivoting said shaft in response to pivoting of saidreleasing bracket and means adapted for receiving a steering forceapplied to pivot said releasing bracket, a pair of spaced tabs on one ofsaid steering arm and said releasing bracket and a projection extendingbetween said tabs and in the path of movement of said tabs on the otherof said steering arm and releasing bracket for providing a range oflimited lost pivotal movement therebetween prior to effecting commonpivotal movement, whereby initial pivotal movement of said bracketrelative to said steering arm in response to the application of asteering force effects relative pivotal movement between said bracketand said steering arm and relative pivotal movement of said shaftrelative to said king pin to effect release of the engagement of saidwrap spring with at least one of said king pin and said swivel bracket,and whereby continued pivotal movement of said bracket effects commonpivotal movement of said steering arm with said bracket to effecTpivotal movement of said propulsion unit relative to said swivelbracket.